These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
Youâre all set! 1  Russian President Vladimir Putin told reporters during his annual end-of-year news conference that he welcomes calls by U.S. Republican presidential frontrunner Donald Trump for deeper relations with Russia. He says Trump is the man to watch. (Reuters)